Visible absorption and photocurrent spectra of epitaxially deposited phthalocyanine thin films: Interpretation of exciton coupling effects

Lai Kwan Chau, Craig D. England, Siying Chen, Neal R Armstrong

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

The Q-band absorbance spectra or photocurrent spectral maxima from epitaxially grown AlPc-Cl, GaPc-Cl, and InPc-Cl thin films, grown on the metal dichalcogenide SnS2, were compared with the spectral peak positions predicted from an extension of the molecular exciton model, adapted for thin film aggregates of these same Pc'S. These comparisons are made possible by the narrow line shapes in the Q-band spectra of these molecules when ordered Pc films are produced. Such narrow line shapes result from the highly homogeneous environments for these dyes. Correlations between the spectral shift in the Q-band and the number of monolayers in the ultrathin film were made and suggest that reasonable approximations can be made to the perturbation in exciton energies in closely spaced 4-fold symmetric chromophores such as the phthalocyanines. The calculations also show that the Q-band position and full width are sensitive to the packing geometries of adjacent chromophores, which may be useful in characterizing a variety of highly ordered thin film dyes and organic superlattices.

Original languageEnglish (US)
Pages (from-to)2699-2706
Number of pages8
JournalJournal of Physical Chemistry
Volume97
Issue number11
StatePublished - 1993

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visible spectrum
Photocurrents
Excitons
photocurrents
excitons
Chromophores
absorption spectra
Thin films
Coloring Agents
Dyes
thin films
chromophores
line shape
Ultrathin films
dyes
Superlattices
Monolayers
Metals
superlattices
Molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Visible absorption and photocurrent spectra of epitaxially deposited phthalocyanine thin films : Interpretation of exciton coupling effects. / Chau, Lai Kwan; England, Craig D.; Chen, Siying; Armstrong, Neal R.

In: Journal of Physical Chemistry, Vol. 97, No. 11, 1993, p. 2699-2706.

Research output: Contribution to journalArticle

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AB - The Q-band absorbance spectra or photocurrent spectral maxima from epitaxially grown AlPc-Cl, GaPc-Cl, and InPc-Cl thin films, grown on the metal dichalcogenide SnS2, were compared with the spectral peak positions predicted from an extension of the molecular exciton model, adapted for thin film aggregates of these same Pc'S. These comparisons are made possible by the narrow line shapes in the Q-band spectra of these molecules when ordered Pc films are produced. Such narrow line shapes result from the highly homogeneous environments for these dyes. Correlations between the spectral shift in the Q-band and the number of monolayers in the ultrathin film were made and suggest that reasonable approximations can be made to the perturbation in exciton energies in closely spaced 4-fold symmetric chromophores such as the phthalocyanines. The calculations also show that the Q-band position and full width are sensitive to the packing geometries of adjacent chromophores, which may be useful in characterizing a variety of highly ordered thin film dyes and organic superlattices.

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